William g



NJKETERS, PHOTO-LITHOGRAPHER WASHINGTON D C waited gisten4 `aient militer.

WILLIAM G. IIEsLEP.

AND THOMAS A. Coo-HRANE, or JAMES- TowN, CALIFORNIA.. f

Leners Patent No. 91,627, daad Imaz, 1869.

IIWPROVED CREWAVSHER`AND CONCENTRATOR.

The Schedule referred to in these Letters Patent and making part of the same. i

' and use our said invention or improvement, without further invention or experiment.

Our invention relates-to a new and improved device forconcentrating or separating and gathering in a body, sulphurets, after the orehas'been put through the mill; and 1 A It consists of a series of troughs, having an inclinar tion in opposite directions, so that the pulp, after being 'fed to the upper trouglhwili be carried from one to the other, back 'and forth, discharging the sulphurets into .eachv lower4 `trough successively, while the sand and debris are 'gradually separated from it, and carried away through spouts at the 4lower ends of the'troughs.

To more fully illustrate andA explain our invention, reference is had to the accompanying drawings and let ters marked thereon, forming part of this specification, of which.-

Figure l is a side elevation.

Figure 2 is an end View of the troughs.

Figure 3 is a top view.

Similar letters of reference in eachof the gures indicate like parts.

A'is a foundation, or frame, having upright posts B- B' at each corner. v

Across Veach end ofthe frame, between these posts, extend supports a a, which serve to uphold the troughs These troughs increase in width from the bottom to the top, each one being wider than the one below it,v

and are set at an incline, so that each one will standwise ofthe frame, is a tank,-O, into which fresh water is constantly fed i`om a trough above, shown in red.

Hollow posts, E E, having their lower ends closed, `connect uwit-h the tank C at each end, and pass down beside the upright posts B.

VThe pipes e e lead the water from the hollow posts,

and discharge it at the upper end of each trough,

where'it catches and carries off the refuse matter;l

The lower ends of the troughs are open, audlead' into vertical spouts G G', which convey the water and refuse matter to the discharging-trough H beneath.

Near the lower end of each of the troughs the bot tom is divided, leaving the portion d free to mo've in ways back and forth, sothat it may be set so as to leave an opening of any desire'd width, through which the sulphurets may fall to the trough beneath.

` The pulp or tailings to be treated pass into the elevated end of the upper trough D, through the pipe shown in red, and pass down to the opposite end, where the sulphurets and heavy particles-fall through the opening to the upper end of' the second trough, the

sand and debris being carried through the vertical spouts and discharged at the bottom.

When the sulphurets, orportion of the pulp which has passed to the second trough, strikes the upper portion of the trough, the fresh water ti'om the pipes e e carries'it down the trough, and the particles of gold vrwill. cling to the amalgamated surface, while the sulphurets, more thoroughly cleaned, will fall, as before, to the next trough, and the sand and debris, as before, pass o" through the vertical spout.

Thus the snlphurets are carried down the inclined troughs one after another, and as they descend, are more thoroughly cleansed, until they finally pass into the spout I, and are deposited into any suitable receptacle.

Any number of inclined troughs may be used necessary to completely separate the sulphurets and refuse'matter, and they may be set at a greater or less incline, according to circumstances.

. By the use'f this device, we are able to separate the sulpliurets from the refuse matter without the use.

of blankets or other apparatus.

Having thus described our invention, 4 What we claim, and desire to secure by Letters Patent is- 1.- Theinclined troughs D D, having amalgamated bottoms, and having the section d moving in ways so as to form an opeuing,'through which the sulphurets may pass tothe troughsbelow, the whole arrangedv substantially as described.

2. The perpendicular spouts G G, for carryingfoi 'the surplus water and refuse matter, substantially 'as and for thepurpose herein described.

3. The tank C, hollow posts `E E, and pipes c e, for

introducing water to the heads'of the troughs, sub-- stautially as and for the purpose' described.

In witness whereof, we have hereunto set our hands 

